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T. HILL.

POWER ELEVATOR. o. 279,243. Patented June 12,1883

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- 1 UNITED STATES.

PATENT OFFICE.

THOMAS HILL, OF QUIN CY, ILLINOIS, ASSIGNOR OF TVVO-THIRDS TO PLINY B.WILLIAMS AND CEYLON SMITH, OF SAME PLACE.

POWER-ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 279,243, dated June 12,1883.

- Application filed November 29, 1882. (N model.)

act description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and

to letters of reference marked thereon, which form a part of thisspecification.

The object of my invention is to prevent accidents caused by theunwinding of an elevator-rope on the drum when the truck or cage isaccidentally retarded or stopped in its descent. This I accomplish byutilizing the slack of the rope to operate a weighted roller press.

ing against it, which, through the medium of the mechanism hereinafterdescribed, reverses the motion of the drum or stops it.

In the drawings, Figure 1 is a side elevation. Fig. 2 is an end view. v

A represents the elevator rope or cable, one end of which is fixed tothe elevator truck or cage, and the other is wound around the drum A,which is fast on the shaft B. This drum- ,shaft B is journaled in ahanger at one end and in the case B at the other end, which extendsthrough and beyond said case.

Fast 011 the shaft B, withinthe case, is a worm-wheel, b, which isengaged and driven by a worm, c, on the counter-shaft (3, havingbearings in hangers c c, and in a suitable formation depending from thecase B.

On the shaft 0, between the hangers c, are the. pulleys 1, 2, and 3, thecentral pulley, 2, being tight on the shaft, and pulleys 1 and 3 beingengaged by belts having contrary mo tions, so that when the belts areshifted the one engaging pulley 1 and the one engaging pulley 3 willalternately engage the tight'pulley, thus unwinding or winding the ropeon the drum at the will of the operator, 'or automatically, in themanner hereinafter set forth.

Loose on the end of the shaft B is the lever D, composed of two armsextending in oppo-.

site directions from the sameboss, the upperof which is shorter ,and isset farther back than the lower arm. Pivoted and, when in its firstposition, projecting at right angles to the end of the upper arm is thepawl d, provided with a tooth, d, to engage the corresponding teeth ofthe ratchet-wheel E, which is fast on the drum-shaft B, between thelever D and case B, immediately under said pawl. Pawl d is provided witha laterally-projecting finger, e, which is engaged by the arm F. Thisarm is rigidly fastened tothe end of the rock -shaft H, and is adaptedto automatically lift the pawl d and disengage the ratchet E, ordrop thesame and engage said ratchet, according to the oscillations of therock-shaft. This rock-shaft is j ournaled in suitable bearings, h, andis parallel to and a little above the plane of the shaft B. WVithin thebearings h on the rock-shaft are the arms k, which have suitablebearings in or near their extremities for the weighted roller L. Thesearms areinclined toward the rope A, against which the weighted rollerbears. Thus it will be ob served that when, from any cause whatever, therope A becomes slack-for instance, when the elevator truck or cagecatches or is retarded in its descentand the rope becomes slack-theweighted roller bearing against it falls to the position shown in dottedlines in Fig. 1, thus oscillating the rock-shaft and dropping the arm F,taking away the support it furnished to the pawl d, which drops upon andengages the ratchet. The ratchet carries the pawl forward a shortdistance sufficient to oscillate the lever D. The lever D has a studprojecting laterally from its lower end, which passes through the slot 8in the link P, the

other end of which is pivoted to the shiftingh bar 1), whichreciprocates in suitable guides projecting from the hangers c c, and isprovided with two yokes, as shown, through which the belts driving theadjacent pulleys pass.

The length of the slot 8 corresponds to the extreme end of the slot, asat r, so that the instant the rope slacks the belts will be shiftedone-half the throw of the shifter-bar, so that both belts will be uponthe loose pulleys 1 and 3, thus stopping the machine, or be shifted theentire throw of the shifter-bar from pul leys 1 and 2 to 2 and 3, thusreversing the motion of the same.

What I claim as new, and wish to secure by Letters Patent, is

1. The combination, with an elevator-rope, A, of an actuating device forstopping or reversing the motion of the drum upon which said rope iswound whenever said rope is slack, consisting ofa weighted rollerjournaled in arms k, a rock-shaft, H, from which said arms extend, andan arm, F, on the end thereof for transmitting the motion of saidrock-shaftto the rest of the mechanism.

2. The combination of the arm F, operated as hereinbefore described,with the pawl d, pro- -vided with a lateral finger, e, the lever D, and

the ratchet 'E, as and for the purpose set forth.

3. The link I, pivoted to a belt-shifting device, having a slot longenough to allow the 25 belt-shifter to move the belts from pulleys 1 and2 to 2 and 3. without moving the lever D, as hereinbefore specified.

4. The combination, with the drum,weighted roller, arm, lever, pawl, andratchet, of a belt- 0 shifting device, substantially as described,connected to the lower end of said lever by a link, in the manner andfor the purpose hereinbefore set forth.

In testimony that I claim the foregoing as 3 5 my own I hereunto affixmy signature in presence of witnesses.

THOMAS HILL.

Witnesses:

JAMES H. OoYNE, FRANK THOMASON,

J. O. HARTLEY, CHAS. H. BAGBY.

